oracle base64加密

SQL> set serveroutput on
SQL> DECLARE
  2  r RAW(32767);
  3  BEGIN
  4    r := utl_raw.cast_to_raw('123456');
  5    dbms_output.put_line(r);
  6 
  7    r := utl_encode.base64_encode(r);
  8    dbms_output.put_line(utl_raw.cast_to_varchar2(r));
  9 
 10    r := utl_encode.base64_decode(r);
 11    dbms_output.put_line(utl_raw.cast_to_varchar2(r));
 12  END;
 13  /
 
313233343536
MTIzNDU2
123456
 
PL/SQL procedure successfully completed